/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.drools.util;

import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * Class meant to provide utility methods specific to <code>Path</code> management
 */
public class PathUtils {

    private PathUtils() {
    }

    public static Path getSecuredPath(Path basePath, String userPathStr) {
        Path targetPath = basePath.resolve(userPathStr).normalize();

        if (!targetPath.startsWith(basePath)) {
            throw new SecurityException("Path traversal attempt detected: " + userPathStr);
        }

        String securePath = trimTrailingSeparator(targetPath.toString().replace('\\', '/'));
        return Paths.get(securePath);
    }

    public static Path getSecuredPath(String basePathStr, String userPathStr) {
        Path basePath = Paths.get(basePathStr).normalize();
        return getSecuredPath(basePath, userPathStr);
    }

    public static String trimTrailingSeparator(String p) {
        return !p.isEmpty() && p.charAt( p.length() -1 ) == '/' ? p.substring( 0, p.length() -1 ) : p;
    }
}